diff --git a/source/libs/sync/test/syncRefTest.cpp b/source/libs/sync/test/syncRefTest.cpp
index 1a75ffa75f..8e9adbbc15 100644
--- a/source/libs/sync/test/syncRefTest.cpp
+++ b/source/libs/sync/test/syncRefTest.cpp
@@ -95,6 +95,7 @@ void *func(void *param) {
   }
 
   taosReleaseRef(tsNodeRefId, rid);
+  return NULL;
 }
 
 int main() {